Apparatus for removal of soot from the smoke boxes and fire tubes of marine and like boilers



M y 1929. N. E. M CLELLAND APPARATUS FOR REMOVAL OF SOOT FROM THE SMOKE BOXES AND FIRE TUBES OF MARINE AND LIKE BOILERS Filed July 5, 1923 2 Sheets-Sheet m R a My I J MflWW QM NQ M S N R NSQ R H NQ w n w w iwhf o o o o o o o w O MN 0 o \w\1 h\ 0 O O A o o o v. 2.. 0 \O O o o o o o R \5 w o 0 o 09 0 o o O A Q 0 O O oooomoo 00 000 4 m m 0 VW m 6? WWW Y a y 21, N. E. M CLELLAND 1,713,76

APPARATUS FOR REMOVAL OF SOOT FROM THE SMOKE BOXES AND.FIRE TUBES OF MARINE AND LIKE BOILERS Filed July 5, 1923 2 Sheets-Sheet 2 Patented May 21, 1929.

tll ll'lhl) dTATES ra'rarrr OFFICE.

NOR-MAN EMILE MGCLELLAND, OF LONDON, ENGLAND.

APPARATUS FOR REMOVAL $0031 FROM THE SI/IOKE BQXES ANDEZRETUBES OF lvIARINE AND LIKE BOILERS.

Application filed July 5,1923, Serial No. 849,655, and in Great Britain November 16, 1922.

This invention relates to the removal of soot from the smoke boxes and the tubes of direct tube and return tube types of boilers by means of fixed steam or compressed air blowers.

ln boilers of this type soot collects more particularly in the bottom or lower portion of the smoke box and seriously affects the steaming oi the boiler, and the eilective removal of this soot is dependent upon its disturbance by blower jets designed to keep the soot in suspension and the induction of an Lip-draught to carry it off.

According to the present invention therefore two sets of steam or compressed air nozzles are provided in pipes fixed horizontally in thesmoke box, one set nearvthe bottom of the smoke box being adapted to disturb the deposited soot and keep it in suspension while the other set, at a higher level or levels, is adapted to induce an lip-draught to carry off the soot insuspension. In boilers having furnaces at different levels the draughtdnducing and the soot'disturbing tubes are arranged at appropriate levels in the various sections of the smoke box. The lower level tubes may, if desired, be provided with upwardly directed draught-inducing nozzles in addition to the nozzles provided for preventing the deposit of soot or disturbing soot already deposited.

The apparatus may be arranged to be swung outwardly so as to leave the boiler tubes easily accessible for replacement or other purpose, and in the case of a smoke box divided into separate compartments the 11oz zle apparatus of each unit may be separately movable in this manner.

One embodiment of the invention, as applied to a four furnace marine type boiler, is illustrated in the accompanying drawings, wherein Figure 1 is an interior view of the smoke box with the rearwall removedshowing the end of the boilers in elevation; Figure 1 is a view showing the interior of the smoke box with the rear wall removed and the end of the boilers in elevation and disclosing a modified form of the invention; Fig. 2- a section on line 22 of Fig. 1; Fig. 3 a vertical section on line 3-3 of Fig. 1; and Fig. i a vertical section on line l-l of Fig. 1.

As therein shown a single steam pipe A provided with upwardly directed nozzles A to the flue A traverses horizontally the centre sections B, B and wing sections C, C

of the smoke box. The steam supply pipe D which is provided with a control valve 1) external to the smoke box is connected with pipe A by a swivel coupling E located at one end of pipe A, the other end of which has a suitable bearing or pivot within the. smoke box, so that the pipe can be rotated as a whole about its axis alternatively intermediate swivel couplings E may be provided to permit the independent rotation of each section or groups of sections as shown in Figure 1. r

From the centre of each section of pipe A a branch pipe F extends downwardly towards the bottom of the respective sections of the smoke box to convey steam from pipe A to the nozzle pipes G and H in the centre and wing sections respectively. As shown, there are two such pipes in each centre section, the upper pipes being provided with rip-draught inducing nozzles G as well as with nozzle G adapted to disturb deposited soot. As the soot tends to accumulate mainly in the angle between the tube plate I and the bottom of the smoke box, the steam pipes, carrying the soot-disturbing nozzles are located in that angle and the-nozzles G are directed inwardly towards the fire tubes J, and may be spaced as shown to register with the two bottom rows of fire tubes. At each end of the lower pipes G there is a rearward extension provided with nozzles G directed towards the back of the smoke box to prevent deposition of suspended soot in that region.

The arrangement of the soot-disturbing nozzle pipes H in the wing sections of the smoke box is similar to that of the centre sections, an additional short length of pipe being provided owing to the irregular level of the smoke box floor in these'sections. The uppermost of the pipes H are provided with rip-draught inducing nozzles H in addition to the inwardly directed soot disturbing nozzles H and the lower pipes H are provided with rearward extensions at the two ends of the smoke box section having nozzles H adapted to prevent deposition of soot atthe back of the section.

The several sections of thesteam blower are provided with clamps K by means of which they are secured to the smoke box in the operative position. By opening the smoke box doors and undoing clamps K the blower be swung outwards as awhole or in sections (according to the subdivision up or other purpose.

of pipe A by'intermediate swivel joints E), leaving the fire tubes accessible for tightening Having thus described the nature of the said invention and the best means I know of carrying. the same into practical effect, I claim V p 1. In a boiler having horizontal fire tubes leading to a vertical flue, an apparatus for the removal of soot from the smoke box of said flue and from the firetubes comprising a horizontal pipe situated i in the upper portion of said smoke-box and connected. to a supply or gaseous-fluid under pressure and nozzles directed upwardly from said pipe and horizontal pipes situated in the lower portionol said smoke box andconnected to said upper pipe and nozzles from said lower pipes directed towards the fire tubes and towards the rear wall of said smoke'box.

' QuIn a boiler having horizontal fire tubes leading to a vertical flue, an apparatus for til the removal of soot from the smoke box of said flue and from the fire tubes comprising a horizontal pipe situated in the upper portion of said smoke box and connected to a supply of gaseous fluid under pressure and nozzles directed upwardly from said pipe and horizontal pipes situated in the'lower portion of said smoke box and a pipe connecting the upper pipe to thelower pipes, and

nozzles from said lower pipes directed some vertically upwards," some laterally towards the fire tubes and some laterally towards the rear of the smoke box.

, 3. In a boiler having horizontal fire tubes leading to a vertical flue, an apparatus for the removal of soot from thesmokebox of said flue and from the fire tubes comprlsing a horizontal pipe fixed in a definite position leading to a vertical flue, an apparatus for the removal of soot from the smoke box of said flue and from the fire tubes coinprlslng 'a'horizontal pipe fixed in a definite position in the upper portion of said smoke'box and divided into independent rotatable sections each provided with nozzlesand horizontal pipes situated in the lower portion of said I smoke box and connected to said upper pipe,

and nozzles from said lower pipes-directed towards the fire tubes'and towards the rear wall of said smoke box.

5;In a boiler having horizontal fire tubes leadingto a verticalflue, an apparatus for the removal of soot from the smoke box of.

said flue and from the five tubes comprising a horizontal pipe situated in the upper portion of said smoke box and connected to a supply of gaseous fluid under pressure and .nozzles directed upwardly from said pipe,

and a set of horizontal pipes one row'above the other situatedoin the lower portion of said smoke box and apipe connecting the lower pipes to the upper pipes and conveying fluid under pressure from the upper pipe to the lower set of pipes and nozzles from said lower pipes directed towards the fire tubes and towards the rear wall of said smoke box.

6. In a boiler having horizontal fire tubes leading to a vertical flue, an apparatusi or the removal of soot from the smoke box of said flue and from the fire tubes comprising a horizontal pipe situated inthe' upper portion of said smoke box and connected to a supply of gaseous fluid under pressure and nozzles directed upwardly from said pipe, and a set ofhorizontal pipes situated in the lower portion of saidsmoke box and connected to the upper pipe, onerow of saidlower horizontal pipes having rearward horizontal extensions wlth nozzles directed respectlvely towards the rear of and diagonally acrossthe smoke box. 7

' 7. In a b01161 having horizontal fire tubes leading to a vertical flue, an apparatus for the removal of soot from. the smoke box of said flue and from the fire tubes com-prising a horizontal pipe situated in the upper portion ofsaid smoke box and connected to a supply otgaseous fluid under pressure and nozzles directed upwardly from said pipe, and a set of horizontal pipes formed of lengths and adapted to fit the contour ofthe floor of the smoke box, two of said pipes having rearward horizontal extensions with nozzles extending therefrom directed respectively towards the rear of and diagonally across the smoke box.

8. In a boiler having horizontal'fire' tubes leading to a vertical flue, an apparatus for the removal of soot'irom the smoke box of said flue and from the tubes comprising a horizontal pipe pivoted. in the upper. por.-'

tion of said smokebox and connected toa'supply of gaseous fluid, under pressure, and nozzles directed upwardly from said pipe and horizontal pipes situated in the lower portion of said smoke box, a pipe connected to the upper pipe and to the lower pipes and adapted to be swung outwardly as a whole about the axis. of said upper horizontal pipe,

1 and nozzles-from said lower pipes directed towards the fire tubes and towards the rear-wall of said smoke box.

In testimony whereof I nameto this specification.

NORMAN EMILE MCoLELLAND.

have signed my 

